Patent US3923346A successfully refreshed from Google Patents.
US3923346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual circuit brake valve
Assignee: Echlin Inc
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Filing: 1973-12-10
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Granted: 1975-12-02
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Expires: 1993-12-10
Abstract
Abstract A brake application valve is used to connect two supply tanks to two different brake systems. The valve has a pair of shuttle members which normally close communication between the inlets and the outlets and open communication between the outlets and exhaust. There are two pistons, movement of which is effective to move the shuttle members to open communication between the inlets and outlets and close communication to the exhaust. One of the pistons has a mechanical connection with the second or inner piston to the effect that movement of the first piston causes initial movement of the second piston with fluid pressure, made available by the initial opening of communication between the first inlet and outlet, causing subsequent movement of the second or inner piston.
Inventors
- 👤 Boleslaw Klimek
- 👤 James W Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
B; B60; B60T; B60T15/00; B60T15/02; B60T15/04; B60T15/043; B60T15/045; B60T15/046
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
234 words
A brake application valve including a housing having a first inlet and a first outlet, a second inlet and a second outlet and an exhaust outlet, a first shuttle in said housing normally closing communication between said first inlet and outlet, a second shuttle in said housing normally closing communication between said second inlet and outlet, said shuttles normally maintaining communication between said outlets and said exhaust outlet, a first piston in said housing yieldingly urged away from said first shuttle, a second piston in said housing yieldingly urged away from said second shuttle, mechanical means fixed to said first piston and positioned to cause said second piston to follow inward movement of said first piston, inward movement of both pistons moving said first and second shuttles to open communication between said inlets and outlets and close communication to said exhaust outlet, said second piston, with said mechanical means being positioned to cause movement thereof, having an outer circumferential surface exposed to fluid pressure at said first outlet to cause movement of said second piston in response to fluid pressures supplied to said first outlet; said second piston having an inner portion and an outer portion, with said mechanical means being positioned to cause movement of said inner portion, said outer portion having the circumferential surface exposed to fluid pressure at said first outlet and being mounted in sliding engagement with said inner portion.
Claim 2
Dependent Claim
234 words
A brake application valve including a housing having a first inlet and a first outlet, a second inlet and a second outlet and an exhaust outlet, a first shuttle in said housing normally closing communication between said first inlet and outlet, a second shuttle in said housing normally closing communication between said second inlet and outlet, said shuttles normally maintaining communication between said outlets and said exhaust outlet, a first piston in said housing yieldingly urged away from said first shuttle, a second piston in said housing yieldingly urged away from said second shuttle, mechanical means fixed to said first piston and positioned to cause said second piston to follow inward movement of said first piston, inward movement of both pistons moving said first and second shuttles to open communication between said inlets and outlets and close communication to said exhaust outlet, said second piston, with said mechanical means being positioned to cause movement thereof, having an outer circumferential surface exposed to fluid pressure at said first outlet to cause movement of said second piston in response to fluid pressures supplied to said first outlet; said second piston having an inner portion and an outer portion, with said mechanical means being positioned to cause movement of said inner portion, said outer portion having the circumferential surface exposed to fluid pressure at said first outlet and being mounted in sliding engagement with said inner portion.
Claim 3
Dependent Claim
38 words
The structure of claim 1 further characterized in that said outer portion and said inner portion are substantially concentrically arranged and said outer portion includes an inwardly extending flange for engaging said inner portion of said second piston.
Claim 4
Dependent Claim
27 words
The structure of claim 2 further characterized in that said outer portion encircles said inner portion, and a seal is positioned between said inner and outer portions.
Claim 5
Dependent Claim
20 words
The structure of claim 3 further characterized by and including a peripheral seal between said outer portion and said housing.
Claim 6
Dependent Claim
20 words
The structure of claim 2 further characterized in that said mechanical means is positioned, in part, within said inner portion.
Claim 7
Dependent Claim
56 words
The structure of claim 5 further characterized in that said mechanical means includes a rod attached to said first piston and extending through said first shuttle to a position within said second piston, and a bridge member attached to said rod, adjacent one end thereof, and positioned to contact the inner portion of said second piston.
Claim 8
Dependent Claim
27 words
The structure of claim 1 further characterized by and including seal members attached to said first and second shuttles and positioned to form seals of said housing.
Claim 9
Dependent Claim
27 words
The structure of claim 7 further characterized by and including seals on said first and second pistons positioned to form seals with said first and second shuttles.
Claim 10
Dependent Claim
24 words
The structure of claim 8 further characterized in that the seals on said shuttles are positioned radially outside of the seals on the pistons.
Claim 11
Dependent Claim
41 words
The structure of claim 1 further characterized by and including a pair of springs positioned within said first piston, force applied to said first piston, from outside of said housing, compressing said springs and causing inward movement of said first piston.
Claim 12
Dependent Claim
25 words
The structure of claim 10 further characterized by and including a moveable cover in said first piston for closing said springs within said first piston.
Claim 13
Dependent Claim
19 words
The structure of claim 10 further characterized in that the springs in said first piston have different spring rates.
Claim 14
Dependent Claim
29 words
The structure of claim 1 further characterized in that the bottom surface of both pistons are flat circular contact surfaces for sealing against the seal members of the shuttles.
Claim 15
Dependent Claim
25 words
The structure of claim 1 further characterized in that the mechanical means engages at least one of the pistons along a spherically curved contact surface.
Claim 16
Dependent Claim
41 words
The structure of claim 14 further characterized in that the second piston supports a rod seat member, the concave surface of which engages the spherically curved bottom surface of the mechanical means when the first piston is forced into the valve.
Claim 17
Dependent Claim
24 words
The structure of claim 1 further characterized in that a circumferential groove is formed in the side of at least one of the pistons.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |